Tim Burke admitted that he knows some fans and industry critics are a "little nervous and sceptical" of 3D conversions, but insisted that the final film in the series will leave people pleased.

"I think it's good, actually," he told the LA Times of the 3D version. "I think people are going to be really pleased. I know everyone's a little nervous and sceptical of 3D these days, but the work has been done very, very well.

"We've done over 200 shots in 3D and in the visual effects as well, because so much of it is CG, so the results are very, very good. I think everyone's going to be really impressed with it, actually."

Burke admitted that his team had worked on post-production for the David Yates-directed conclusion to the series "past the wire".

"We really pushed it right way to the end of any possible time on this one," he said. "We had the big conversion to 3D as well, and that sort of added a massive complication. So yeah, we've used every second we possibly could."